Locks the camshaft sprockets in the proper position to allow the drive belt to be removed or replaced.

Models: Astra-F (93-98) / Astra-G (98-06) / Astra-H (04-11) / Combo-C (05-08) / Corsa-B (94-00) / Corsa-C (00-07)
              Frontera-A (95-98) / Frontera-B (98-04) / Meriva-A (03-10) / Omega-B (94-03) / Signum (03-07) 
              Sintra (96-99) / Tigra (95-00) / Tigra-B (04-10) / Vectra-B (95-02) / Vectra-C (02-08) / VX220 Speedster (03-06) 
              Zafira-A (99-05) / Zafira-B (05-13) / Cruze (09-10) / Saab 9-3 (03-10) 

Engines: 
               - 1.4 16v: X14XE
               - 1.6 16v: LXT / X16SEJ / X16XE / X16XEL / Y16XE / Z16XE ecoFLEX / Z16YNG
               - 1.8 16v: C18XE / C18XEL / X18XE / X18XE1 / Z18XE / Z18XEL
               - 2.0 16v: C20SEL / C20XE / X20XEV / X20XER / Z20LEH / Z20LEL / Z20LER / Z20LET
               - 2.2 16v: X22SE / X22XE / Y22SE / Y22XE / Z22XE 

OEM: 
          NARROW - KM852
          WIDE - KM853 / EN-852 / EN-853