B77 – Fits 77mm Core Bit – Standard Block (Metric) Style:With Bolt Block Dimensions: 99

Block Dimensions: 99

the B6” delivers bulls-eye accuracy

the B76 delivers bulls-eye accuracy

Block Dimensions: 173mm x 75mm (Note: this refers to block size

Block Dimensions: 35mm x 75mm (Note: this refers to block size

B77 – Fits 77mm Core Bit – Standard Block (Metric) Style:With Bolt Block Dimensions: 99Designed for precision, safety, and speed when core drilling by hand. The B77 Block is built to help you hit the mark every time no expensive rigs, no risky setups. Just accurate, safe, and efficient drilling. Trusted by core drillers, plumbers, sparkies, drain layers, and even DIYers, the B77 delivers bulls eye accuracy, faster setup, and safer operation on concrete walls, floors, manholes, pipes and more. Key Features: Core Bit Fit: Designed for