Nüvo drawer slides (sold in pair) model 56.21 Full extension drawer slide with integrated soft-close mechanism Positive stop for fully extended drawer Hold-in feature to prevent bounce back Lever disconnect for easy drawer removal Open access design for easy cabinet installation Steel ball bearing movement Side clearance: ½? (12.7mm) plus 1/32? 32mm hole pattern with breathing tabs 45 kg (100lbs) load rating Finish-Anochrome (ANO) 500 mm (20")