The Lumberjack Tools commercial tenon cutters are ergonomically designed and feature a 60° tapered shoulder profile (like the tip of a pencil) that is very common in traditional rustic furniture. The tools are safe, fast & easy to use to use. 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 RPMs or less). tenon cutters are backed by Lumberjack Tools lifetime warranty. 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" - 4" in diameter. Includes: 1 1/2" Tenon Cutter, (1) set of blades (includes (2) blades, (2) shims, (4) button screws, (1) Allen wrench) & (1) manual. Made in the USA.