21" Tandem slide - full extension Blum 562H5330C Blum 562H5330C 21" Tandem slide - full extension - totally concealed undermounted drawer slides - 100 lb weight capacity - minimum cabinet depth 21 7/8" - 16mm (5/8") maximum drawer side thickness - Locking Devices (T51.1700) sold separately - Face Frame rear mounting brackets (295.3750) sold separately - Mounting jig (T65.1000.02) sold separately Price: $105 for Box of 6 Pairs