Makita D-34861 Hole Saw Set 4 Piece Large (20-51mm) For Wood / Metal / Plastic. The Bi-Metal hole saw range have a vari-pitch tooth design and are recommended for cutting steel, aluminium, copper, brass, wood and plastic. Kit contains 20, 25, 32 and 51mm bits + 1 arbor.Features:Large hole saw kit. Fast cutting and long life. Sizes carefully selected for the professional plumber. Bi-metal hole saws with variable tooth pitch. With plastic case. Fast cutting and long life. Comes with 4 hole saws in sizes 51, 32, 25 and 20mm, 2 Arbors and a Carry Case.