the smc "T" shaped pickets cut in half have worked well for me for many years. metal conduit really doesnt have enough strength or resistance for climbing, but has been used extensively on big mountains for rappelling long routes[its cheap]. also, if you live near seattle, go to boeing surplus and buy the W shaped aluminum aircraft framing. it has large surface area, you can choose your thickness [strength vs weight] and make them any length you like.i feel they hold better than regular pickets. give thought to how you thread them so you dont compramise the webbing. if you avoid shnice, youll miss out on alot of better ice further on:}