Hook Gamakatsu SL11-3H or similar heavy saltwater hook, 6
Thread Olive 210 denier
Materials
Eyes Black-nickel brass dumbbell (one pair (5/32 or 1/8 in))
Claws Olive micro Ultra Chenille (two, singed to points)
Legs Large gray barred square rubber legs (3 pairs)
Body Olive/tan Scotch-Brite or scouring pad (one trimmed carapace)
Weed guard Hard mono (optional) (one loop)
How to tie it
Mount the hook and start thread. Figure-8 the brass dumbbell eyes near the bend on top so the fly rides hook-point-up.
At the rear, tie in two lengths of olive Ultra Chenille as claws, singeing the tips to taper them, splayed in a V.
Add three pairs of gray barred rubber legs across the shank, splayed to the sides.
Cut an oval crab carapace from a Scotch-Brite pad and bind it flat over the shank so it sandwiches the legs, locking it with cross wraps.
Trim the pad to a neat crab-shell oval and tint the top with marker if you want a mottled look.
Add a hard-mono weed guard if fishing grass, build a small head, and whip finish. Lead cruising permit and redfish, let it sink to the bottom, and give it short strips to hop like a crab.