600-Packs of 1/4″ x 1/2″ Aluminum Oxide Bands available in 60, 80, 120, 180, 240, 320 or 600 grit. This is NOT a typographical error! 600 packs, you choose which abrasive grit. A-4672-600 – 60 gritA-4673-600 – 80 gritA-4674-600 – 120 gritA-4675-600 – 180 gritA-4676-600 – 240 gritA-4677-600 – 320 gritA-4678-600 – 600 grit Use with mandrels A-SD328 or A-SD188. Made in USA. 40,000 RPM Max Speed. 3Ms Aluminum Oxide Abrasives are made of high-grade mineral and a bonding system that reduces shelling of the mineral. These economical abrasives are excellent for fast clean-up and pre-polishing work. Use the Sanding Bands with 3/32″ (2.35mm) and 1/8″ shank rubber drum mandrels. To install, slip band onto rubber drum with screw loose. When band is in position, tighten the screw, which expands the rubber drum, for a secure hold.*Optimum Operating Speeds are much lower (between 25% – 50% of maximum speeds) and also depend on the type of workpiece. Micro-Tools makes every attempt to provide accurate information for each item. Actual packaging and/or specifications may be slightly different from the information and picture provided.