3.1 Trough idler (35°)
3.2 Trough idler (45°)
3.3 Forward-tile trough idler (35°)
3.4 Transition idler (10°)
3.5 Transition idler (20°)
3.6 Transition idler (30°)
3.7 Buffer idler (30°)
3.8 Buffer idler (45°)
3.9 Upper friction self-aligning idler
3.10 Upper taper self-aligning idler
3.11 Upper friction flat self-aligning idler
3.12 Parallel upper idler
IV. Return idler
4.1 Parallel lower idler
4.2 V-shaped idler
4.3 V-shaped forward-tilt idler
4.4 Parallel comb idler
4.5 V-shaped comb idler
4.6 Lower friction self-aligning idler
4.7 Inversed V-shaped idler
4.8 Lower taper self-aligning idler
4.9 Screw idler
V. Roller of idler
5.1 DT II general-type roller
5.2 DT II buffer roller
5.3 DT II comb roller
5.4 DT II screw roller
5.5 DT II upper taper self-aligning idler
5.6 DT II lower taper self-aligning idler
5.7 DT II friction self-aligning idler