Sako OptiLock 1 inch /30mm scope mount bases and rings set. Sako OptiLock scope mount bases and rings set. 30mm-Stainless Low/Medium/Hi.--Black: Medium/Hi. 1 inch-Only low. Specifically designed to fit the integral dovetail rails on Sako rifles. Local is preferred, but will ship at buyers expense. Valid Pal a Must. Please send message to: [email protected]