Syntec 1-5/8" GCB42BK Pro Diamond Wet Core Drill Bit for Concrete ST Fastening Metal Roofing Screws They are easy to use

They are easy to use and are proven to make your structure stronger

Lumber Size: Intended for use with 4x beams and 4x posts/columns and includes necessary SDS screws for quick installation

watertight fit around pipes

even pressure when driving for best performance

center in beam

Syntec 1-5/8" GCB42BK Pro Diamond Wet Core Drill Bit for Concrete ST Fastening Metal Roofing Screws They are easy to useSyntec has been working hard for over two decades to manufacture exceptional power core bits for the construction industry. Syntec's diamond drilling tools can be used for a wide range of applications whether it is light or heavy duty drilling. The GCBBK Pro core bits are an ideal option for drilling into medium to hard concrete with medium steel reinforcements. Syntec's drill core bits feature diamond tipped segments and fittings comprised of sturdy