Genuine Weber OEM part # 70359 non-locking Caster and Insert. This caster will not fit on Genesis and Summit models made 2012 and after. If needed for newer models, order Weber caster # 79499. Fits: Spirit series (2009-2012), Genesis series (2007-2011), and Summit series gas grills (2007-2011). Caster diameter: 2-7/8". Caster Stem length: 1-1/4". This is a non-locking caster.