collapsible crab trap

[Fisha]

Hello I'm new to the boards and kinda new to crabbing only having ever hand line crabbed as a kid.  I live near a cabelas and they have collapsible crab traps made by Promar model TR-301.  I was wondering if these are good to use from a bridge or pier/dock while hand lineing. The opening seems kinda small at 5" but I have never used a crab trap like this so I don't know.  Any info you experts can give me would be greatly appriciated!  Thanks!
Matt

[MD17Crabber]

if your talking about the two on the right these are pots, and you cant use them in maryland unless ur commercial or throwing them off your peir/property.  I dont know if you can use them off a public peir or dock though.  A crab trap has 2 or 4 doors and the bottom cant be no bigger then 12 in.

[Fisha]

Yeah pretty much like the one on the bottom right.  I will be crabbing mostly in NJ so I think I will be legal using one of these.  Does anyone have any reports on how effective these are?  I want to put one or two out while I use the triangle traps or handlines.  Any tips or good places anyone is willing to share would be awesome! Thanks again!

Matt