Drill bits for intercepting wood block.Specification��Material��45 # carbon steelSize��1/4�� Take wood(dia) 6.3mm3/8�� Take wood 9.5mm1/2�� Take wood 12.7mm5/8�� Take wood 15.8mmshank��10mmcan get block up to 27mm.Feature:Carbon steel is durable.Precision production， smooth surface.Caution:suitable for bench， speed not too fast， otherwise will smoke， charred， etc.!Package inckude:4x drill bits