The Original Wrench-Biner™ is a carabiner made out of 6Al-4V Titanium that has either 5 standard size or 6 Metric size wrenches built in. The wire gate is also made out of individually heated and bent 6-4 titanium rod. Finish options are tumbled, fine peen bead blast, tiger stripe anodized, and heat anodized. A very handy keychain tool. 

Specs:

• Body: 6Al-4V Titanium
• Gate: Heat anodized 6Al-4V Titanium
• SAE Wrench sizes: 1/4", 3/8". 1/2", 3/4", and 1".
• Metric sizes: 8, 10, 12, 15, 18, and 21mm. 
• Weight: 1.15 oz. 

While I have tested each to hold myself at 200 lbs, they are NOT Intended for climbing.