50 yellow caps. Fits all standard grease fittings. 1.67 in. overall length.Inner diameter of cap is 15/64 (fits all standard and metric grease fittings). Eye diameter of the securing loop is 25/64 in. Appropriate for threading onto 1/4"-28 SAE fittings or M6. For larger fittings, such as 1/8" NPT, the securing strap can be placed over the top of the grease fitting with ample room for the cap to secure as well.