MAXX Model CNC Stainless Steel/Aluminum Spring Guide CNC Stainless Steel/Aluminum Spring Guides are designed to keep the spring in line and allow the spring to rotate on shaft during high compression, suitable for AEG version 2 gear box upgrades. This Spring Guide is machined with an M5 thread on stainless steel hub to hold the stock securely and equipped thrust ball bearing to reduce spring stress and breakage during high speed spring compression. Made of Stainless Steel and Aluminum. Includes 1 x CNC Stainless Steel/Aluminum Spring Guide Specification Hub Internal Thread: M5x0.80 Hub Outer Diameter: 16mm Shaft Outer Diameter: 10.8mm Shaft Length: 44.5mm Overall Length: 51.5mm Material: Stainless Steel and Aluminum Features Stainless Steel and Aluminum construction Machined M5 thread on stainless steel hub Equipped thrust ball bearing to reduce spring stress and breakage Aligned spring in line and rotate on shaft during high compression Strong stainless steel hub chamfer shoulder designs