Petzl Croll Chest Ascender. For use in conjunction with either a handled or basic ascender for ascending a rope. The trigger cam has teeth ensuring better performance on wet / dirty ropes, with spring-loaded moulded catch providing easier use even when using gloves. EN397: 1997 & EN12841 Class B: 2006. Weight 130g. Suitable for use with kernmantle construction ropes between 8 & 13mm diameter (10 & 13mm dia. under EN12841) that are CE marked to EN1891 or EN892. See manufacturer’s instructions for