... certification5. has the barb: 1 barb, 2 barbs, 3 barbs on each edge6. has working blade: 25gg, 20gg,25gg, ... 30gg, 32gg, 36gg, 38gg, 40gg, 42gg 15*18*40*3 ... in Millimeter is 0.48)Nominal Length (in inch), 3 ( needle total length in Millimeter is 76.2 ) ... Millimeter is 3.18)No. of barbs on first edge, 2No. of barbs on 2nd edge, 2No. of barbs on 3rd edge, ...