Roll designs provide high capacity but they vary in shape and the tool must MATCH the coil of staples dimensions to feed well and shoot consistently. Such is the case with the D.18 ROLL for those who have been using JK 55 and BeA LOCK type staples and want an interchangeable tool for their shipping and packaging department's needs. Here we find the 16.5 gauge wire type. 5/8" and 3/4" leg lengths. Omer Internationally sources this "D" series tool model and releases it only after having tested it, for those who require this great staple type.