Set of Original Skip-Stitch blades 1, 2,& 3 & One 45mm Rotary Cutter The #1 blade is perfect for perforating fleece and similar fabrics such as vinyl, felt, and soft foam. The #2 blade is designed especially for lighter fabrics such as flannel. The #3 blade can be used with larger crochet hooks and larger yarns. Fits all 45mm Rotary Cutters. 45mm Rotary Cutter included in Combo! Great for sewing, crocheting, knitting, lacing, scrapbooking and so many other projects!