Ed Brown Products Machined Extended Thumb Safety 1911 Match Lever Profile Blue. 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 Extended Thumb Safety What firearm models does the manufacturer say Ed Brown Products 1911 Machined Extended Thumb Safety is compatible with? The manufacturer says that Ed Brown Products 1911 Machined Extended Thumb Safety is compatible with 1911Ed Brown Products 890-MATCH: Machined Extended Thumb Safety 1911 Match Lever Profile Blue