Precision Prop Reamer Standard.What stands out Enlarges holes in propellers and spinner back plates-just turn the removable T-handle to cut perfectly centered 1/4" 5/16" and 3/8" holes Constructed of hardened carbon steel Stepped design increases accuracy Includes plastic storage case Can be used with a drill press for extra precision Caution: Extremely sharp. Keep well oiled to avoid corrosion. Reamer Length: 4" (102mm) Hole Sizes: 1/4" 5/16" 3/8" Standard (SAE) What comes in the box(1) Precision Prop Reamer StandardSpecifications Product Length 2.75" (70 mm) Tool Type Reamers Manufacturer part number GPMQ5006. Checking a part against a model you already own? Send us the number and we will confirm the fit before you buy.Why buy it hereRC Hobby Pros is a real hobby shop in Katy, Texas — not a drop-shipper. We have been in RC for 30 years, we stock parts for what we sell, and we fix what you break. Every vehicle gets checked before it leaves the counter and we will walk you through the first run. Come see it at 555 S Mason Rd, Katy, TX 77450 or call 346-365-2987.