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The. #99.20 full stainless steel is a Limit device with stainless steel track, arm and detach clip

product picture shown is an e-gard finish, we now sell full stainless steel parts only.

The hardware is designed to restrict the opening on projected or casement windows. This mechanism automatically stops the vent at a safety position as required by the user, or required by law

See attached spec sheet for more details about opening degrees position