New Motorcycle car valve spring compressor KZ CB GS XS 550 750 tool The listin is for Heavy-Duty Motorcycle & small engine Valve Spring Compressor. It will compress valves for the following sizes: Size: 30mm (OD.) - 27.5mm (ID.) , Size: 25mm-23.5mm Size: 23mm-21.5mm , Size: 19mm-16.5mm , Size: 16mm-13.5mm Each collet length is 1 & 3/4" This tool is designed specifically for small motorcycle engine applications