Stromberg Carlson Pre Drilled Aluminum Ladder Rung For La 401 La 460 Or La 466 Ladders. It is intended as a replacement for a broken or damaged rung. Each rung features a built in no-slip tread. Hole Diameter: 1". Width between holes: 10". Total Width: 12.75". Features of Stromberg Carlson 8538-T Pre Drilled Aluminum Ladder Rung For La 401 La 460 Or La 466 Ladders Designed for use with Stromberg Carlson's LA-401 external ladder or LA-460/LA-466 interior ladders Built in no-slip tread Hole Diameter: 1" Width between holes: 10" Total Width: 12.75" Package Contents: Stromberg Carlson 8538-T Pre Drilled Aluminum Ladder Rung For La 401 La 460 Or La 466 Ladders Stromberg Carlson 8538-T: Pre Drilled Aluminum Ladder Rung For La 401 La 460 Or La 466 Ladders