The Lumberjack Tools commercial tenon cutters are ergonomically designed and feature a 60° tapered shoulder profile (like the tipe of a pencil) that is very common traditional rustic furniture. The tools are safe, fast & easy to use to use and the tenon Cutter works like a giant pencil sharpener. build your own log beds, log railings, log fences, log tables, log chairs, log arbors, log benches & more! A 1/2" Heavy duty drill is recommended for use (Specs: pipe handle drill, single-speed, 450 RPM's or less). tenon cutters are backed by Lumberjack Tools lifetime . Commercial tenon cutters are die cast from automotive grade aluminum and feature dual blade technology to cut Tenons quickly and efficiently. Accepts a Log from 2-1/2" - 4-1/2" In diameter. Includes: 2" Tenon Cutter, (1) set of blades (includes (2) blades, (2) shims, (4) button screws, (1) Allen wrench) & (1) manual. Made in the USA