"I last bought these 5 years ago, and whilst the price has gone up 20% they are identical to the ones I was replacing. The last set had worn down the rear nylon wheels, which is understandable given the number of open / close cycles the drawer had been through (around 300 per day). Once there is a flat on a wheel, it continues to wear until unusable. The real downside of these is that they can't take a lot of weight in the open position, so consider something like 51598 if your drawer is to be operated by a gorilla."
"Quite nice runners, smooth operation, drawer easily removable by tilting it, self-closes the last couple of inches and also holds the drawer in the open position. No mounting details were given in the specification - I have found that you need half an inch clearance between each side of the drawer and the inside of the carcass. The length given is the overall length of the runner,"
"they did just what i hoped - they silenced the wife - before i bought these - nag - nag - nag - the drawer does not work - on and on so i would recommend them for that alone - plus the quality was excellent"