This lock is a high-security, keyless deadbolt lock that is made of high-hardness aluminum alloy and has passed the FCC SDOC certifications. It is suitable for door thicknesses of 35-50mm and door hole diameters of 38/54mm and has a high safety factor. The price drops from $64.99 to $29.99. Shipping is free for prime members, or it adds $6.