Stens Shield All Season 770-706 1 gal Bar and Chain Oil - As a leader in aftermarket replacement parts, Stens provides parts to the outdoor power equipment, industrial/rental, hardware, turf management, golf course, and agricultural equipment markets. Stens, headquartered in Jasper, Indiana, joined Arrowhead Engineered Products, based in Blaine, Minnesota, in December 2016. This merger combined two of the strongest aftermarket parts suppliers in the industry.