Internal: 3-1/2" thru 7"(90mm thru 175mm) - External: 3-1/2" thru 7"(90mm thru 175mm) - The Model 87 is the safest, most compact, and precisely designed tool available to service extra large retaining rings - Tip Sizes, Bent 20-degree: .120”(3.0mm), .150”(3.8mm), .180”(4.6mm) - Tip Sizes, Bent 72-degree: .120”(3.0mm), .150”(3.8mm), .180”(4.6mm) - Provides safe and stable service of extra large retaining rings - Compound screw lever for easy ring installation and removal