19 mm diameter, 57.5mm overall length, right hand turn, and 10mm shank. * The 57.5mm long bits have a 10mm x 20mm shank with an adjustable top screw 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