The Salsa EXP Series 35. 0 Anything Cradle Arms are for mounting the Salsa EXP Series Anything Cradle (sold separately) to handlebars with a 35. 0mm or 31. 8mm clamp diameter. Compatible with 35. 0mm bars or 31. 8mm bars (with included shims)Compatible with all Salsa EXP Series Anything CradlesHinged clamps allow for easy installation and removal from handlebarsMade of 6061 forged aluminum