Oglaend M6 Long Spring Nut for Channels T316 Stainless Steel (As Unistrut P1006M6) Ideal for use with Unistrut P1000 & P2000 channels, also P3270 Concrete inserts Approximate Dimensions (Approximate because springs are by their nature slightly variable, and hard to measure) Head Dimensions: 35 x 20 x 5 mm Spring Dimensions: 35 x 17 mm Total Length: 40 mm