Abus bike folding locks 610090 blackredwhite abus 52637 the abus bike folding lock 52637 4 red 610090 has been designed for good protection at medium theft risk and is recommended for securing good bicycles the bars the case the links as well as the supporting elements of the locking system are made of special hardened steel this quality lock has a number of excellent features including 5mm steel bars with extra soft 2 components coating to prevent damage to the bicycles paintwork