Specifications: cone (2mm)' diamond size (3mm)' diamond size (4mm)' diamond size (5-6mm). Uses: Used for pony stitching or thicker leather rowing. No 3 diamond-shaped through the hole adapted to height 5-6mm,. 2 is suitable for the shape of a diamond through holes with 4mm height. 1 diamond-shaped through the hole for the height of 3mm.