Check the listing for details. Barry King Back Beveler Swivel Knife Attachment, Leather Working Tool. Condition: New. Listed at 39.95 USD. This Barry King Back Beveler Swivel Knife Attachment is great for rounding edges. The concave surface is particularly useful around borders. The shank on the blade is 7/32" in diameter. Fits all swivel knives we carry as well as most Craftool style swivel knives. Will NOT fit in a Barry King swivel knife. Make sure to measure the shank on a blade that fits your knife before purchasing. 1 - 5/32" wide 2 - 7/32"wide Barry King Tools have gained a reputation for making quality tools for the serious leather craftsman. Barry is a master leather stamper, so he knows how a tool should be made and you can see that in each of his tools. If you have been wanting to take your leather carving to the next level, investing in tools made by Barry King is a great first step.