1 5/8" x 1/2" Gas Male Thread 7-Segment High-Speed Finger BitThis is the 1 5/8" x 1/2" Gas Male Thread 7-Segment High-Speed Finger Bit and this is just what you need. This is the new Super Cyclone 7-Segment Finger Bit, and it has a smaller diameter and seven segments designed to cut faster than most other bits. It has a bottom segment that enables drilling into a slab like a core bit. This is a top quality bit which is ideal for hard materials This tool operates with the following parameters:Feed rate: 10" ~ 20"/min; Speed: 4500 – 6000 RPMs. It has a 1 5/8" x 1/2 Gas male thread. These diamond finger bits are made for high-performance shaping in fabrication applications.