The Peak® Material Clip is provided with 2 sizes of pring to grip a wider range of materials better. Peak's straight coil design works better than a conventional wrapped spring, which results in the spring coils forming an inverted "V". This straight coil results in parallel slits which will hold your materials more securely. The Peak Material Clip will fit 1/4" diameter shafts. Clips can rotate to any angle needed or completely out of the way and multiple Material Clips can be used in tandem.