General description This AlwaysH Set of 4 Square Hole Drill Bits is designed for woodworking enthusiasts, providing a practical solution for drilling square holes. Made from durable carbon steel and heat-treated for longevity, this set includes four different sizes: 1/4" (6.35mm), 5/16" (7.94mm), 3/8" (9.5mm), and 1/2" (12.7mm). Ideal for use with a mortise machine or attachment, these drill bits help reduce labor intensity and speed up construction processes. Technical specifications Material: Carbon steel Sizes: 1/4" (6.35mm), 5/16" (7.94mm), 3/8" (9.5mm), 1/2" (12.7mm) Usage Designed for drilling square holes in wood Best used with electric drills and hammers (not included) Can achieve enhanced results when used with a mortise and tenon machine Other information Manual measurement may result in 1-3cm error Color differences may occur due to lighting and display variations