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 & rear wheels. • You will need a 14mm spanner to fit it• You must carry the key & spanner with you whilst cycling to allow wheel removal for punctures etc.• Can only be used on bikes with QR skewers & will not work with solid, nutted axles• Set features front wheel skewer, 1 Pits & 1 Security Code ID• Duplicate keys can only be ordered using the security code supplied • Parts made from quality rustproof high-grade steel • Easy to install & use