Aluminum Padlocks are the lightest-weight aluminum locks on the market and made from recycled material. Standard-size lock body measures 1.6 in. H x 1.5 in. W x 0.75 in. D. Bright, anodized aluminum finish provides greater visibility and fade-resistance in all environments. Reserved, paracentric keyway provides optimal security (prevents someone from getting a copy made at a local key shop). Aluminum shackle has superior spark and corrosion resistance.