Yes — see the Fold N' Hold Deluxe Cube (BG-CUBE) if you just need the cube without the line and bags

Stainless steel construction means it stands up to moisture

What does "Keylock" mean

or any other object without having to tie a knot

Are the gaffs on the Buckingham climber set replaceable

YALE KERNMASTER ROPE 1/2" DIAMETER by-pass Yes — see the FoldStatic rapelling Kernmaster line is constructed with a traditional "mantle" sleeve consisting of 48 strands of polyester. The inside, or "kern," is a braided core of energy absorbing nylon. The core is fully steam stabilized to enhance the rope's flexibility and prevent hardening in service; the braid also bends more easily than most ropes. Tensile Strength: 10,500lbs Diameter: 1 2"