The Stanley Tools Tylon™ Pocket Tapes have a corrosion resistant, long-life, nylon coated blade, with bi-material case for improved grip and positive blade lock for accurate measurements. Fitted with a Tru-zero hook, that compensates accurately for internal and external measurements, with triple rivet construction for improved strength and durability.. This Twin Pack, contains the following:. 1 x Tylon™ Pocket Tape 5m/16ft with a blade width of 25mm.,1 x Tylon™ Pocket Tape 8m/26ft with a blade width of 25mm.. Accuracy: Class II..