【13 HOLE SAW BLADES & 39 ACCESSORIES】13 x Bi-metal hole saw blades, 13 x mandrels, 13 x drill bits, 1 x box. Each hole saw kit is fully assorted and individually packaged, which effectively avoids the situation where the drill bit holder cannot be removed and other saw blades cannot be used after using one size of saw blade. 【HIGH PERFORMANCE】-The hole saw adopts heat-treated M42 bi-metal saw band, and the cutting part is made of high-quality high-speed carbon steel. The product has the advantages of high temperature resistance, no deformation, and long service life. The diameter is 18, 20, 22, 25, 28, 30, 35, 38, 45, 50, 55, 65, 75 mm and the maximum cutting depth/thickness is 25 mm 【CUTTING DESIGN】 The saw tooth adopts an arc design, concentric precision, uniform tooth edge, impact resistance and anti-fall. The hole saw kit adopts a non-binding sharp edge design, easy to cut. After drilling, the drill spring will automatically push the disc out of the saw. 【WIDE APPLICATION】