Freud BP63570R Industrial Carbide Tipped Brad Point Boring Bit Right Hand 1/4 inch Diameter- 10mm Shank- 70mm Length 1/4 inch diameter, 70mm overall length, 35mm max hole depth, right hand rotation, 10mm shank. The 70mm long bits have a 10mm x 20mm shank making them compatible with most boring machines. Drills all composition materials, solid surface materials, plywoods, hardwoods, and softwoods. Use on automatic and manual muti-spindle boring machines Freud's Limited Lifetime Guarantee