Niro Steel roller double base kit comprises: 2 pairs of pulleys Transformer Sliding throat 16 x 28 19 with Delrin core width 14 or 16 mm, 2-axle 6 x 82 with 4 screws M4 x 6 1 stopper along with 3 screws AUTOFIL. 2.9 x 13 1 pair shores wave type along with 4 screws AUTOFIL. round head 3.5 x 13 configuration Iron pulleys with 2 quality bearings Niro Steel 6 x 15 x 5, Iron mono configuration:1 pulleys with bearing quality Niro Steel 6 x 15 x 5; configuration Glass: Glass pulleys with bearings 2 6 x 19 6;
