Each set includes: 1pc extension 6pc wood flat bits: 10, 13, 16, 19, 22, 25mm 5pc wood working drill bits: 4, 5, 6, 8, 10mm 4pc hole saws: 1-1/4"(32mm), 1-1/2"(38mm) 1-3/4"(44mm), 2-1/8"(54mm) 1pc arbor 1pc hex key wrench: 2.5mm