TWO REQUIRED FOR ONE COMPLETE SET UP ONE PER SIDE REQUIREDThe off road product page you entered displays the best locking fasteners on the market. All Stage 8 Locking Fasteners will stay tight in the harshest operating conditions. Stage 8 Locking Fasteners developed the X-Lock, a patented Locking Spindle Nut replacement assembly for Dana 30, 35, 44, 60 & 70 spindles. The X-Lock system is laser cut from 4130 steel for a perfect fit. All components are heat treated and through hardened for superior strength and dependable performance. The Stage 8 X-Lock will never loosen. The manual locking hub kit is also manufacturer model specific for 2 different styles of locking hubs. The collector kit is similar to all of our fasteners which are extremely durable and will never loosen.The patented Stage 8 Locking Spindle Nut is comprised of 5 parts; a thrust washer, a specialized notched washer, the spindle nut (which can be set to an individual pre-load value), a locking retainer and a heavy spring steel snap ring. The Locking Spindle Nut assembly is easily installed without any specialized tools and spindle nut itself can be locked within ½ degree of any position so you will never have to over or under torque and will maintain the required bearing preload value. This extremely tough innovation withstands severe reverse torque, a real plus when you’re 25 miles away from civilizationX-Lock Part # DescriptionDNA -44 (5) Piece Locking Spindle Nut System Dana 30*, 35*, 44 Spindle 1 5/8″ x 16DNA -60 (5) Piece Locking Spindle Nut System Dana 60 & 70 Spindle 2″ x 16* * Must be equipped with manual lock-out hubs Also Fits GM Corporate 10 & 14 BoltPart #Kit NameDescriptionDNA -44GM Corporate 10 Bolt(5) Piece Locking Spindle Nut System with 1 5/8″ x 16 NutDNA – 60 **GM Corporate 14 Bolt(5) Piece Locking Spindle Nut System with 2″ x 16 Nut.