Fulterer FR 5609, heavy duty drawer slides with up to a 225 lb. weight capacity. A unique feature to the FR 5609 is that it has a metal release lever.

Fulterer FR 5609,
heavy duty drawer slides, shorter sizes have a 1 inch over extension and up to
225 lb. weight capacity. A unique feature to the FR 5609 is that it has a
metal release lever. These drawer slides are ideal filing cabinets, office furniture, architectural millwork and commercial applications where a heavy capacity is needed. The drawer rails are made from cold rolled zinc plated steel and have precision steel ball bearings.
Fulterer FR 5609 Specifications 
(1 mb PDF file)