heavy duty locking drawer slides self-lock device, heavy duty slide A4 file size heavy duty locking drawer slidesself-lock device, heavy duty slideA4 file sizeknock-down packing,the colors and sizes up to customer's request.our normal size(mm):1320H*900W*450D, 4 drawer1020H*900W*450D, 3 drawer720H*900W*450D, 2 drawer heavy duty locking drawer slides