FFP Series Finger-Lock Flange Covers FFP Series finger-lock flange covers feature a die-cut configuration with locking bolt hole tabs to keep protector in place without adhesive or separate fasteners. Material: Low-Density Polyethylene Color: Black B A FAN Series Flange Covers with Bolt Holes FAN Series flange covers with bolt holes securely cover the full face of any ANSI B-16.5 and ANSI B-16.47 flanges and sealing surfaces with use of additional plugs (FBH Series) or cable ties (CAB Series) through four bolt holes. Material: High-Density Polyethylene Color: Black Note: Additional materials available: .200 impact board .125 corrugated polyethylene 366 * For other material and color options, contact customer service.