Our mandrels are 5/8″ diameter, with a length of 5.5″. They are straight shank and made to be used in a collet chuck or can be used with a 4 jaw chuck. Our mandrels have 2 and 3/4″ of knurling and come in two different knurls. All our mandrels have a black oxide coating applied to help with rust prevention.
Fine knurl is designed for use on acrylic (especially clear/transparent) where as little scratching as possible is needed inside the barrel.
Rough knurling can be used with either wood or acrylic but was designed for use on wood where you want more bite and inside scratching isn’t as important.