Brand Name: Steel Grip *Product Type: Power Drill Accessory Set *Material: Carbon Steel *Number of Pieces: 12 pieces *Packaging Type: Blister Pack *12 piece wood and masonry set.  Professional quality for smooth, accurate drilling. Use on soft or hard woods. Ideal for the drilling of materials such as concrete, stone, brick and cement as well as for the majority of building materials. Sizes Included: 1/8",5/32",3/16" and 1/4" (6 wood and 6 masonry bits). Shank Diameter: 6.3mm  Shank Length: 78cm-120cm.