Commonly called roll pins or C pins Mechanics and DIYers, these Prime-Line slotted spring pins (also called roll pins or C pins) are essential hardware for so many projects! At 5/16 inch diameter by 1-1/2 inches long, they're perfect for securing components in machinery, furniture, automotive applications, and countless other assemblies Slotted spring pins are headless hollow cylindrical tube having a longitudinal slot down the entire length with chamfered or round ends to aid installation. Slotted, Inch, Slotted Spring Pin, 5/16 dia,1 L,Slotted,PK25 - 41LV84 Hollow Dowel Pins Prime-Line 9188838 Split Spring Dowel Pins, 8 Mm X 3.8 Cm Spring Pin Slot along length of pin allows it to compress during insertion into hole Slotted Spring Pin 1/16" x 3/16" 1070-1095 Carbon Steel Phosphate ASME B18.8.2 Inserts through holes of two or more objects to hold them together The pressure provides tension in a radial manner to prevent loosening created by vibration or shock.