ENABLES YOU TO ADJUST THE PIVOT ON THE KERSHAW FLYTHROUGH AND ZT 0609 The new Kershaw Flythrough (model 1988) and the Zero Tolerance 0609 both feature RJ Martins unique See-Through Pivot (STP). This oversized pivot is hollow in the center, letting you see through it. But a regular hex or torx tool wont work to adjust it. To meet the need that just about every knife user has to tinker, Kershaw introduces the STPTOOL. Its specifically designed to let you adjust the STP on the Kershaw Flythrough and the ZT 0609 so you can have things as loose or as tight as you prefer. Tinker away. FEATURES: For use with Flythrough knife (KS1988) and the ZT0609 ring pivot Handle: Stainless steel, titanium carbo-nitride coating Overall Length: 2.75 in. (7 cm) Weight: 2.2 oz. (63 g)