Cut and bent steel reinforcement bar in Shape Code 13 Shape Code 13 vs Shape Code 21. Shape Code 13: This code represents a U-shaped rebar with a circular bend that forms a gap at the bent part. Shape Code 21: This code represents a U-shaped rebar without a circular gap at the bent part. It is a regular U-shaped rebar, meaning it doesn’t leave a gap at the bent point, making it a perfect 90° Degree bent. These descriptions highlight the difference between shape code 13, which features a circular gap in the bend of the U-shaped rebar, and shape code 21, which does not have this circular gap. Shape Code 13 Image - showing a gap in the radius bent point. Shape Code 21 Image - Showing 90° Degree bent All sizes available: 8mm Custom Cut & Bent Rebar in Shape 13 10mm Custom Cut & Bent Rebar in Shape 13 12mm Custom Cut & Bent Rebar in Shape 13 16mm Custom Cut & Bent Rebar in Shape 13 20mm Custom Cut & Bent Rebar in Shape 13 25mm Custom Cut & Bent Rebar in Shape 13 32mm Custom Cut & Bent Rebar in Shape 13 40mm Custom Cut & Bent Rebar in Shape 13 Order online custom bent rebars or send us your rebar bending schedule.