The model 3000-B bottle crimper is supplied with 1 collet of your choice. The stock collets available are 28mm, 20mm, 18mm, 17mm, 15mm, 13mm. The collet is adjustable to increase or decrease crimp depth. Depending on the operator, you can do 12 to 15 containers per minute. Many custom collets are also available for making valve assemblies as well as 1" can valves with an external crimp. The only maintence required is a dab of high pressure grease on the outside of the collet periodically depending on use. If you would like us to calibrate the crimper for you send us 6 bottles/cans & valves. Ready to use when it arrives. This product is entirely American made, all replacement parts are in stock if ever needed. Same day shipping ia available *There is no charge for calibration upon purchase.