The BULLDOG top wind trailer jack crank handle is designed for use with BULLDOG top wind series 150, 160, and 170 trailer jacks. It is a genuine BULLDOG replacement part. Using genuine BULLDOG replacement parts is the best way to maintain the integrity of any BULLDOG product as it is manufactured by the most trusted name in the industry.• Compatibility: Bulldog 150/ 160/ 170 Series 2000 To 5000 Pounds Capacity Topwind Jack• Radius (IN): 6-3/4 Inch Red Bulldog knob For 750 to 5000 lbs. jacks 5000 lbs. TW / GTW | Fulton Bulldog Trailer Tongue Jack Crank For 750-5,000 lbs Jacks