Walter 1 9 16 X 1 Icecut Annular Core Cutters Weldon Shank RPM_1750 RPM Compact and Ergonomic: The switch Size:LL5215 Compact and Ergonomic: The switch features a compact design that is easy to handle and install Aircap of WRA M200 is designed for simply assembly by assemble or disassemble only 1 position with turning counter clockwise and also turn aircap into 0 degree position or 90 degree position without tools and check the precision with eye only (you can set more than 0 degree or lower than 90 degree) Diameter 1 9 16" Length 1" Walter ICECUT annular cutters can withstand at least 200 degrees Celsius higher temperatures and produce less heat than a conventional TiAIN cutter