This is a vintage K-D Mfg. Co. No. 715 valve spring lifter tool, a classic piece of American-made automotive history. Featuring a heavy-duty steel C-frame design with a threaded adjustment bolt, this specialty tool was designed for engine valve work on vintage vehicles. The body is clearly stamped with 'K-D MFG CO. PAT 715 PEND'. Ideal for collectors of vintage garage tools or mechanics working on period-correct restorations.