7pcs 22mm-65mm M42 High Speed Steel Bi-Metal Hole Saw Drill Bit Set for Wood 9.8x9.8x15.7inch also used for bridge circuits

also used for bridge circuits

These rods are very nice and easy to cut

the A type  spring will be fitment

Sealed cover prevent liquid leaking

7pcs 22mm-65mm M42 High Speed Steel Bi-Metal Hole Saw Drill Bit Set for Wood 9.8x9.8x15.7inch also used for bridge circuitsThe bi metal hole saw combines high speed steel and cobalt. The hole saw body is made of superior grade M42 high speed steel, which has excellent hardness, wear resistance, and heat resistance. The cutting edges or teeth are made of a cobalt alloy, which further enhances hardness and heat resistance. The sprayed coating resists rust and corrosion. Sharp toothed edges allow for smooth, fast and easy cuts. Bi metal hole saws have larger numbers of