Two special features turn this from a humble honing guide into a deluxe model. Firstly, the roller assembly can be easily removed, allowing the jig to be used in conjunction with a bench grinder (with a suitable 10mm support bar) and, secondly the brass roller itself is 38mm(1.1/2") long, so no worries about it wearing a groove in your stone. On the upper surface a series of lines enable the blade's squareness to the jig to be easily checked. We found a blade projection of about 38mm(1.1/2") gave a good bevel angle.
