KHD1S100-3/16 Heavy Duty 0-1/2” Plier Operated Cleco Fasteners 100 Piece Kit w/ Cleco Pliers & Carry Bag. Cleco Fastener Sets offers incredible value with its durable, polyester carry bag (6” H x 8.5” W) to hold your Clecos and a pair of Cleco Pliers that are designed for installing spring-loaded fasteners. Cleco Fasteners are widely used in automotive, racing, and aircraft sheet metal repair. Cleco Fasteners are spring-loaded and steel bodied fasteners that are designed to temporarily fasten multiple sheets of material together before the pieces are permanently joined. Cleco Fasteners are a simple and inexpensive alternative to competitive fasteners and are available in various lengths and strengths to accommodate different processes.