These Shelf Support Pegs by Prime-Line Products are constructed of plastic and come clear in color. They feature grooved pegs for increased holding strength, while remaining easy to insert/install. Support pegs like these are commonly used by furniture manufacturers to support lightweight glass and shelving made of composite materials. The grooved pegs of these shelf supports have a 1/4 inch diameter and stretch 3/8 inches deep. Removal of broken pegs will be necessary prior to installing new.