3M Dual Lock, Black, 1" wide, 250 stems/inch, sold in 1 foot lengths
Great for securing items in the cockpit. Works well with 250 (itself) but works the best with a the other side having 400 stems/inch. It offers better high temperature performance than the low-profile option above and also offers higher holding strength. Bonds well to metals (aluminum, stainless steel), glass, plastics (acrylic, polycarbonate, ABS) and paints.

Bonding Strength Comparison
(lowest on the left, highest on the right) 
Low Profile/Low Profile < 250/250 < 250/400

Works well with itself, works best with 400 stems/inch 
Sold by the foot - one side only (ordering 1 foot gets you 6 inches of both sides)

See option below for ordering a pair with one side having 250 stems/inch and the other side having 400 stems/inch. That is the option with the strongest holding strength.