【Product Description】 Install a thumbturn guard to prevent thumbturn manipulation through door gaps, security viewers, keyholes, and mail slots. When at home, an internal lock can be added for increased security. 【Specifications】 Compatible Thumbturns: Those with the door side markings LA, MA, BH, or LD. 【Size】 Size (mm): 65 x 71 x 30 【Material】 ABS resin Nomura Tec / Nomura Tec 【Product Details】 【Product Description】 Install a thumbturn guard to prevent thumbturn manipulation through door gaps, security viewers, keyholes, and mail slots. When at home, an internal lock can be added for increased security. 【Specifications】 Compatible Thumbturns: Those with the door side markings LA, MA, BH, or LD. 【Size】 Size (mm): 65 x 71 x 30 【Material】 ABS resin