Gabion Retaining Wall Design Ideas 1/ Stepped back retaining wall improves centre of gravity. 2/ Angular gabion fill provides best interlock. 3/ Pictured 2100mm x 900mm x 900mm gabions. 4/ Top row of gabions 2100 x 900 x 450mm. 5/ Gabions supplied in kitsets delivered to your door. 6/ Easy to assemble and low cost retaining walls 7/ Check out the Retaining wall design guidelines. 8/ Check out our 100's of prices and sizes