Turn scrap into drives, quickly and efficiently, with a Tin Knocker Rollformer. Let this machine pay for itself – and fast! A great connector machine and more! Truly a poly-functional machine, the Tin Knocker Fourplex is the epitome of “value” and “flexibility”. Configured with S & Drive down the center and choice of either Male & Female Button Lock or 3 in 1 and Pittsburgh Rolls, this machine comes standard with S & Drive Slitter to turn scrap into useful product.