Crosby® McKissick 10" Sheave Block w/ Shackle - 5/8"-3/4" wire 1-800-PACK-RAT Full they define design factor as

they define design factor as the "ratio of the breaking strength to the working load limit

Net Weight: 33 lb (15 kg)

4' Security Chain Kit Features:

The chain extension end fittings and the ratchet assembly have a zinc plating for protection from the elements

Also available in a 65-inch option

Crosby® McKissick 10" Sheave Block w/ Shackle - 5/8"-3/4" wire 1-800-PACK-RAT Full they define design factor asThis 10" sheave Crosby McKissick snatch block has a forged steel swivel shackle and works with 5 8" 3 4" wire rope. Hook assemblies on 4 1 2" 14" sizes can be interchanged. The 419 type snatch block is furnished with bronze bushings and meets or exceeds all requirements of ASME B30. 26. View Product Safety Warnings California Residents: WARNING