Ed Brown Products Machined Ambi Thumb Safety 1911 Carry Lever Profile Blue. Shaped for shooting comfort the lever is angled slightly to keep the thumb from contacting the slide and has a double angle to fit the thumb perfectly. Uses a special hammer pin (included) to hold the safety securely eliminating the need to modify the grips. Designed for all 1911 type frames. Requires minor gunsmith fitting for safe operation and includes complete instructions. 3 lever profiles available. Specifications for Ed Brown Products 1911 Machined Ambi Thumb Safety: Manufacturer: Ed Brown Products Gun Type: Pistol Gun Model: 1911 Fabric/Material: Bar Stock Steel Hand: Ambidextrous Features of Ed Brown Products 1911 Machined Ambi Thumb Safety Match Profile: Widest profile levers at 0.247 perfect for matches left hand stages and the high thumb shooting style. Tactical Profile: Medium profile levers at 0.167 considered standard on most custom pistols. Carry Profile: Thinnest profile levers at 0.154 with the ideal geometry. Package Contents: Ed Brown Products 1911 Machined Ambi Thumb Safety What firearm models does the manufacturer say Ed Brown Products 1911 Machined Ambi Thumb Safety is compatible with? The manufacturer says that Ed Brown Products 1911 Machined Ambi Thumb Safety is compatible with 1911Ed Brown Products 892-CARRY: Machined Ambi Thumb Safety 1911 Carry Lever Profile Blue