The pitlock 2 piece skewer is a coded high security protection device that is a direct replacement for the quick release skewers on front wheels and rear wheels you will need a 14mm spanner to fit it you must carry the key and spanner with you whilst cycling to allow wheel removal for punctures etc can only be used on bikes with qr skewers and will not work with solid nutted axles set features front wheel skewer 1 pits and 1 security code id duplicate keys can only be ordered using the s