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Sinclair International brand (Brownells). Similar concept to Hornady headspace bushings, but these are tapered on the inside to match the cartridge shoulder. They fit a standard Hornady caliper comparator (not included).
Four bushing and hard storage case. Case accepts bullet ogive bushings as well.
23 degree - 223 family
20 degree - 308 family
25 degree - standard magnums
35 degree - WSM and 284 families
A comprehensive list of cartridge fitment is linked hrere:
Brownells link