Essential pro for every trad rack (for use as passive protection), Black Diamond"s Stoppers are designed with a transverse taper that permits sideways placements in flares and shallow seams. SPECS: #5 Stopper - Dimensions .33/.53" (8.4/13.5 mm), Strength 6 kN (1349 lbf), Weight 18 g (.63 oz); #6 Stopper - .40/.61" (10.2/15.5 mm), 10 kN (2248 lbf), 32 g (1.1 oz); #7 Stopper - .46/.64" (11.7/16.3 mm), 10 kN (2248 lbf), 34 g (1.2 oz); #8 Stopper - .53/.72" (13.5/18.3 mm), 10 kN (2248 lbf), 37 g (1.3 oz); #9 Stopper - .60/.82" (15.2/20.8 mm), 10 kN (2248 lbf), 39 g (1.4 oz); #10 Stopper - .68/.92" (17.3/23.4 mm), 10 kN (2248 lbf), 43 g (1.5 oz); #11 Stopper - .79/1.05" (20.1/26.7 mm), 10 kN (2248 lbf), 51 g (1.8 oz).