Work Sharp Ken Onion X4 Belt Kit WKS03911 Review Posted by GiftedPheasant December 15, 2018 in Knife Sharpeners Other Info: Five X4 fine grit belts. Belts are fitted for The Ken Onion Edition Work Sharp Knife and Tool Sharpener. Hang Packaged. Cutlery & Knife Accessories Home & Kitchen Kitchen & Dining Work Sharp