Features 7 PCS SET: A total of 7 drill bits with specifications of 1/4in 5/16in 3/8in 2/5in 1/2in 9/16in 5/8in for your use to meet different needs. HSS MATERIAL: Made from high speed steel material, heat treated, these square drill bits have high hardness and long service life. WIDELY USED: Square drill bits are very suitable for drilling square holes in wood with mortise machine or mortise accessories. SHARPLY CHISEL: These drill bits are equipped with sharply square chisels to improve your work efficiency. PRECISE SIZE: These square hole drill bits are fine made, with precise size, could perfectly match with the electric machine. Specification: Item Type: Woodworking Square Drill Bits Material: HSS Hole Drilling Size: 6.4mm (1/4 inch) 8.0mm (5/16 inch) 9.5mm (3/8 inch) 10mm (2/5 inch) 12.7mm (1/2 inch) 14mm (9/16 inch) 16mm (5/8 inch) Package List:7 x Woodworking Square Drill Bits7 x Storage Box Package List 7 x Woodworking Square Drill Bits 7 x Storage Box