Shimano Zee Cranks. I don't know if I'm missing something but I tightened the pinch bolts and all tight and just stopped and the crank arm has been coming off the spindle.
Amazon.com : SHIMANO FC-M640 Zee 10 Speed Crankset (165-mm, 36T with 68/73-mm Bottom Bracket) : Bike Cranksets And Accessories : Sports & Outdoors
Shimano ZEE Crankset - Aloha Mountain Cyclery | Carbondale, CO