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The Spyderco Sub Hilt Dual Action Automatic Knife, designed by Butch Valloton, features an ambidextrous thumb stud along with the Spyderco Round hole to open the blade from either side. This model is a converted manual folder. Converted by Butch Valloton, it can be opened manual just like the folder. It can also be opened automatically by sliding the top (small) G-10 inlay. Since it is an auto conversion, it no longer carries the Spyderco warranty. The thumb stud serves a double role of opener as well as stop pin to keep the blade from rotating beyond the locked position. This Italian style heavy stock folder sports a modified coffin shaped handle of polished black G10 with tounge and groove fitted stainless steel bolsters. The Sub Hilt also has the Michael Walker LinerLock® a four-way: tip-up/tip-down, right- or left-handed steel clip and screw-together scale construction. The tanto blade is CPM-S30V from Crucible Steel Inc. of New York. The blade is hollow-ground at the cutting edge with a convex-grind at the tip and is offered PlainEdged for the best available cutting performance. SPECIFICATIONS: length overall 8 11/16 in (221 mm) length closed 5 in (127 mm) hole diameter 1/2 in (13 mm) blade length 3 3/4 in (95 mm) cutting edge 3 9/16 in (90 mm) blade thickness 5/32 in (4 mm) blade steel CPM S30V weight 6.2 oz (176 g) handle material G-10