Cadmium Steel Flex Top Expanding Hex Nut RH, 7/16"-14 x 3/4" W x 21/64" H, 10 Pc

Thread Size: 7/16"-14

Width: 3/4"

Height: 21/64"

RH Threads, Class 2B Thread Fit

Cadmium Plated Steel Thin Flex Loc Expanding Hex Nuts

The top is slotted that expands when tightened.