The RIDGID Strap Wrenches are best for any polished pipe. They have a sturdy, cast-iron housing with an I-beam handle and a strong, woven nylon strap that gives a tight grip.

Two models available with special strap for plastic pipe.

RIDGID No.5 Strap Wrench 

Handle Length: 450mm (18in).
Strap Length: 750mm (29.1/4in).
Strap Width: 45mm (1.3/4in).
Rated Pipe Capacity: 125mm (5in).
Actual O.D. Capacity: 175mm (7in).
Weight: 0.9kg. 

Rated Pipe Capacity is the nominal diameter that can be correctly tightened.
Actual O.D. Capacity is the actual O.D. that strap can accommodate.