Vierkant-holzbearbeitungsbohrer, Meißel-lochsägen-set 1/4-1/2-5/16-3/8 Zoll

【DESIGN】Professional, ideal for drilling square holes in wood with a chisel drill or chisel attachment. Fits all chisel drills and drill press attachments. Square hole drills are primarily used for woodworking. 【MATERIAL & SIZE】Made of high-speed steel. Heat treatment: HRC48~50, high hardness, extended core, high concentricity; 4 different sizes: 1/4" (6.35 mm), 5/16" (7.94 mm), 3/8" (9.5 mm), 1/2" (12.7 mm) 【WHY CHOOSE THIS ITEM】 Reduce the labor intensity of construction workers, accelerate construction, and lower construction costs for the construction, installation, renovation, and decoration industries. 【PACKAGE CONTENTS】 1 piece 1/4" (6.35 mm); 1 piece 5/16" (7.94 mm); 1 piece 3/8" (9.5 mm); 1 piece 1/2" (12.7 mm)