Duraflex SF105 3/8" x 1 1/4" Aluminum Hex Head Bolt with Nut - This Hex Head Bolt with Nut is used to attach Double Rail Supports to Fulcrum Boxes on all stand models, cross-plates to the Main Support frame on One-Meter and Three-Meter Stands and to attach the Aluminum Rail Bracket (left or right) to Short Stand Anchor Fittings (for stands with Duraflex handrails) to attach rail tubing. These anchor fittings have pre-drilled holes for mounting Double Rail Supports and Aluminum Rail Brackets.