HSS Woodworking Chisels for Drill Attachments DIY Woodworking 7 Pack A [Material]: wood drilling tools are made of steel, with high hardness, strong and durable. Heat treatment, high hardness, elongated core, high concentricity, long service life. [Convenient Chip Removal]: Auger ma standard chip removal design, which can easily remove the side of wood chips and improve drilling efficiency [Advantage]: A set of wood drills reduces the labor intensity of construction workers, accelerates the pace of construction, reduces the construction costs of the construction, installation, decorative, decorative industries. [Wide Application]: Square hole drill bit fits all chiseling machines and drill attachments. Square drill bit is mainly used for woodworking. [Easy to use] Chisels for chiseling consist of two parts, round core drilling and square drilling (as shown in the picture). during installation, these two parts must be held firmly by a clamp. Specification: 7 pieces specification: (6.4/8/9.5/12.7/14/16/19mm) 7 pieces B specification: (6/6.4/8/9.5/10/12.7/14mm) 5 pieces specification: (6.4/8/9.5/11/12.7mm) Specification 3 pieces: (8/9.5/12.7mm) The package includes: Optional package 7pcs or 5pcs or 3pcs square drill hole