All the parts required for assembling bases to receiver and rings to bases are included (plus hex key). The size of base that you need can be determined by the caliber of your rifle and corresponding action type.

Features:

• Built to match the beautiful classical design of a sako rifle
• Designed to match Sako 85 (S-L) 75 (III-V) - Long action rifles
• For mounting optilock rings
• Stainless Steel finish