Alpha® PlasterKing® Backer Pad — 7" M10-1.25 Reverse ThreadHook-and-loop backer pad engineered for the Alpha® PlasterKing® pool plaster polishing system. This specially stocked configuration features an M10-1.25 reverse-thread arbor for pneumatic underwater polishers (compatible with the Alpha® AIR-680UW and similar reverse-thread tooling) so the pad stays locked under wet, submerged use. Pairs with the PlasterKing® 7" #50 and #100 diamond polishing pads (PS070050, PS070100) to deliver a uniform, contractor-grade finish on freshly-cured pool plaster.Features 7" working diameter sized for PlasterKing® PS070050 and PS070100 polishing pads M10-1.25 reverse-thread arbor — locks under load on pneumatic underwater polishers Hook & loop face for fast pad changes between grits Built for wet pool-plaster polishing — not for dry use Compatible with PlasterKing® diamond polishing pads and most 7" hook-and-loop foam, wool, microfiber pads, and sandpaper .dst-accordion { margin-top: 25px; border: 1px solid #FDDCC5; border-radius: 6px; overflow: hidden; } .dst-accordion-item { border-bottom: 1px solid #FDDCC5; } .dst-accordion-item:last-child { border-bottom: none; } .dst-accordion-toggle { display: none; } .dst-accordion-label { display: flex; justify-content: space-between; align-items: center; padding: 14px 20px; cursor: pointer; font-size: 17px; font-weight: 700; color: #231F20; background: #fff; transition: background 0.2s; } .dst-accordion-label:hover { background: #FFF3EB; } .dst-accordion-label::after { content: '+'; font-size: 22px; font-weight: 700; color: #F15C22; transition: transform 0.3s; } .dst-accordion-toggle:checked + .dst-accordion-label { background: #FFF3EB; } .dst-accordion-toggle:checked + .dst-accordion-label::after { content: '\2212'; } .dst-accordion-content { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; padding: 0 20px; background: #fff; } .dst-accordion-toggle:checked ~ .dst-accordion-content { max-height: 5000px; padding: 15px 20px 20px; } Models / Part Numbers Part No. Diameter Thread Use UPC PK710HH 7" M10-1.25 Reverse Backer for PlasterKing® polishing pads 749173480225 How to Use Thread the backer pad onto an M10-1.25 reverse-thread polisher (left-hand thread). Snug by hand — the working load tightens the connection. Press a PlasterKing® #50 (yellow) or #100 (red) hook-and-loop polishing pad squarely onto the face, centered on the backer. Submerge or wet the plaster surface. PlasterKing® is wet-use only. Polish at or below 5,500 RPM with light, even pressure. Let the diamonds do the work. After use, rinse the backer pad and pads with clean water and air-dry away from heat. Specifications by Variant 7" — Hook & Loop face — Hook & Loop Backer Pad — PK710HH Part No. PK710HH UPC 749173480225 Size 7" Type Hook & Loop Backer Pad Attachment Hook & Loop face Thread M10-1.25 Reverse (left-hand) Max RPM 5,500 RPM Recommended For Backing pad for PlasterKing® 7" diamond polishing pads (PS070050, PS070100) Country of Origin See package label Common Specifications Property Detail Application Wet pool-plaster polishing Working Diameter 7 in (178 mm) Arbor Thread M10 × 1.25 reverse / left-hand Pad Attachment Hook & loop Max RPM 5,500 Recommended Tools Alpha® AIR-680UW underwater polisher and other M10-1.25 reverse-thread polishers Companion Pads PlasterKing® PS070050 (#50, yellow), PS070100 (#100, red) Related & Companion Products PlasterKing® #50 Polishing Pad 7" (PS070050) PlasterKing® #100 Polishing Pad 7" (PS070100) Alpha® AIR-680UW Underwater Pneumatic Polisher FAQs Why a reverse-thread (M10-1.25 left-hand) backer pad?Pneumatic underwater polishers such as the Alpha® AIR-680UW use a reverse-thread spindle so the backer pad self-tightens under load while polishing. Using a standard right-hand thread backer on a reverse-thread tool will cause the pad to unthread mid-cut.Which PlasterKing® polishing pads fit this backer?Both Alpha® 7" PlasterKing® polishing pads — PS070050 (#50, yellow) and PS070100 (#100, red) — attach via the hook-and-loop face.Can I use PlasterKing® dry?No. PlasterKing® is wet-use only. All pool contractors polish wet, and dry use will damage the diamond layer and shorten pad life.Is this the same as the MP758HL backer pad?No. MP758HL is the Alpha® 5/8"-11 (standard right-hand) backer pad for rotary polishers. PK710HH is a specially stocked M10-1.25 reverse-thread variant for pneumatic underwater polishers.Why does Alpha® offer only 2 grits for PlasterKing®?Pool contractors typically finish at #100 grit because higher reflective finishes are unnecessary once the pool is filled with water.Is there seasonality for pool-plaster polishing?Yes. Most pool-polishing work happens before and after pool season, so demand for PlasterKing® and its backer pads peaks in spring and fall. VideosNo product-specific videos are currently available from the manufacturer or DST. Documentation 📄 PlasterKing® Pads and Backer Pads Flyer 📄 New From Alpha® 2026 — Hardscape ⚠ WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. Always wear appropriate PPE.
