sch180

Hi, I'm thinking of buying blum runners from Shanghai Tong Lee but notice that the drawer length given by my ID differs from the standard runner length that Blum has. Logically the runners should be shorter than the drawer length and the brochure mentioned to deduct 10 mm from it but even after deducting this some of my drawer length does not fit into the nominal length of the runner blum has. It can be off by either 10 to 20 mm. Any one can advise whether there is allowance for the 10-20 mm difference for the blum runners?