The Sherline P/N 7600 tool post is specially designed to fit the larger3/8" square and round tool holders used for carbide or diamond inserted tips. It is machined from solid aluminum and has a black anodized finish for long life. Purchase of this tool post will allow you to keep your standard 4018 tool post available for use with high-speed steel tools for jobs where they are sufficient and/or a specially ground and shaped tip is required. (Round hole provided for boring tools.) Cemented carbide cutting tips may chip or fragment in use. Always use machine guards, protective clothing and safety glasses to prevent burns or other injury to body or eyes from flying particles or chips. Grinding produces hazardous dust. To avoid adverse health effects, use adequate ventilation and read Material Safety Data Sheet for applicable carbide grade first. For Data Sheet write to: Valenite, 31100 Stephenson Hwy., Madison Heights, MI 48071