Oversized version of the BSD Stacked stem. The Stacked OS stem has been machined internally to save weight & features BSD's gorilla grip system which has a larger 25.4mm clamping diameter to work with Oversized handlebars. The stem clamping area diameter is increased from 7/8" (22.2mm) to 1" (25.4mm). This increase in diameter gives 14% more clamping area than on regular 7/8" handlebars, so when you're nose diving down a 12 set your bars are less likely to slip. section Product Specs TYPE: Top Load REACH: 50mm RISE: 33mm CLAMPING DIAMETER: 25.4mm WEIGHT: 312g