Description: 102mm M22 Diamond Core Drill Bit Hole Saw Marble Granite Cocrete Wall Drill. Specification: Type:Core Drill Bit; Material:High speed steel; Color:Red; Use:Masonry Drilling; Size:102*370MM/4*14.5"; Threaded connection:M22; Quantity:1pc; Features: -4 x 14.5 inch drill bit is perfect for use with electric core drills for drilling on granite, hard stone, concrete, reinforced concrete, and other hard surfaces. -Its durable construction will ensure smooth operation of the drills. -Ideal for Marble/Granite/Cocrete/Wall, the ultimate hole saw for hard-to-cut materials. -With Tiny diamond particles coated tip offers sharp cutting, the efficiency of cutting will be improved greatly. -To prolong its using life, please remember to keep it with coolant sometimes. -Should be used with a electric wet drill, here is not included. -When you using hand electric drill, start slowly, 45 degree angle, go vertical after you make an initial mark. Notice: 1. Please allow a bit error due to manual measurement. please make sure you do not mind before you bid. 2. The color may have different as the difference display, pls understand. Package Included: 1pc x Diamond Core Drill Bit