High quality Hole saw kit contains: Hole saw 19, 22, 29, 35, 38, 44, 51, 57, 64, 76, 83, 92, 95, 108, 114 mm, arbors with art number: 40901, 40905, 40909, accessories with art number: 40915. Hole saw made from bi-metal steel with a high speed steel cutting edge welded to a tough steel back.