Low profile head is designed to prevent snags on uneven surfaces and easier to pull through bulkheads Non-magnetic stainless steel locking device insures both maximum strength and the right tightness every time Because there are no notches, Ty-Rap ties provide an infinite number of locking positions while fastening the tie at the precise bundle diameter needed The No-Slip Tail provides easy grip during tensioning. Ty-Rap ties feature a unique friction surface designed to reduce slippage during installation