Specifications include, but are not limited to: Metal: GCMP, Galvanized Corrugated Metal Pipe and Under-drains. ALCCMP, Aluminum Coated Corrugated Metal Pipe (Type 2) and Under-drains. PPGCMP, Polymer Pre-coated Galvanized Corrugated Metal Pipe and Under-drains CAAP, Corrugated Aluminum Alloy Pipe and Under-drains ; a. 2 × 2 × 3/16 inch galvanized steel angles extending the full width of the band. b. 12 gauge die-cast angle with a configuration that provides at least the same section modulus as the 2× 2 × 3/16 inch angle, extending the full width of the band. c. Minimum of two bolts for a 7 inch wide band, three bolts for a 12 inch wide band, and five bolts for a 24 inch wide band, uniformly spaced. ; . Angles will be connected to bands by one of the following: 1. Spot welds spread over full width of the band, 2. Stitch-welded over the full width of the band, or 3. Attached by rivets.