Autolock collets require cutters with threaded shank ends to screw into the collet itself. Unlike most other machine collet systems, 5C collets were developed primarily for work holding. A Swiss-style lathe holds the workpiece with both a collet and a guide bushing. As the collet segments rotate, the clamping mechanism gains centrifugal force. All use some mechanism to amplify the clamping action of equally spaced collet segments. Care must be taken to ensure the bit shank and router collet sizes match exactly. A spanner is only required to release the locked collet. An internal collet can be used to lock two telescoping tubes together. Another popular size is the 10mm collet used by Clement and Levin. The cone is there to prevent sparks jumping from the collet directly to subject. Zstandard (or zstd) is a lossless data compression algorithm developed by Yann Collet at Facebook. There are many types of collet used in the metalworking industry. In 1987 there came a major objection to Popper's proposal from Collet and Loudon. The reference implementation in C by Yann Collet is licensed under a BSD license. LZ4 is also implemented in newer Zstd archiver by Yann Collet.