Crosstac AR-15 Pin Starter / Driver Stainless. CNC machined stainless steel. Original design allows starting pins without using 3 hands Fits perfectly vertical along the receiver when starting the bolt catch release pin. Handle is designed to fit into the 0.25in take down pins holes and is crossdrilled to start the spring and detent. Start them push the take down pin through while withdrawing our roll pin punch. No more parts flying across the shop (well... maybe two less parts). Super handy. CNC precision-machined from solid stainless rod. Tip is recessed to hold roll pin for easy starting. Handle is cross-drilled to install take down pin springs and detents. Specifications for Crosstac AR-15 Pin Starter / Driver: Manufacturer: Crosstac Fabric/Material: Stainless Steel Color: Stainless Gun Type: Rifle Gun Model: AR-15 Package Contents: Crosstac AR-15 Pin Starter / Driver What firearm models does the manufacturer say Crosstac AR-15 Pin Starter / Driver is compatible with? The manufacturer suggests that Crosstac AR-15 Pin Starter / Driver is compatible with AR-15Crosstac 135220: AR-15 Pin Starter / Driver Stainless