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Here's what other sites are saying:
The Black Diamond Lost Arrow Pitons are light enough that you may forget they're on your harness. But when you're in a thin-to-medium crack and need pin-worthy protection, these bad boys get the job done. Black Diamond crafted these out of hot forged steel to keep the weight down (#1 weighs two ounces) and the strength up. Each piton has a number so you can find the correct size during critical moments where you can't shuffle through all your gear.
Black Diamond Big Wall & Protection Lost Arrow Pitons-#1 BD52050000001__1.
The meat and potatoes of a nail up rack, Black Diamond Lost Arrows are tough enough to withstand repeated abuse - hot forged big wall pitons patterned after the original designs of John Salathe and are as light as possible for their given size.
- Mountain Gear
Description of Black Diamond Lost ArrowsTough enough to withstand repeated abuse, these hot forged big wall pitons are patterned after the original designs of John Salath' and as light as possible for their given size. Features1 Short Thin 532 4 mm 1 34 44.4 mm 56 g 2 oz 2 Short Medium 14 6.3 mm 2 50.8 mm 70 g 2.5 oz 3 Short Thick 516 7.9 mm 2 14 57.1 mm 84 g3 oz 4 Wedge 38 9.5 mm 2 78 73 mm 99 g 3.5 oz 5 Long Thin 316 4.7 mm 3 14 82.5 mm 84 g 3 oz 6 Long Medium 14 6.3 mm 3 38 85.7 mm 99 g 3.5 oz 7 Long Thick 516 7.9 mm 3 12 88.9 mm 117 g 4.1 oz 8 Long Dong 932 7.1 mm 4 58 117.5 mm 122 g 4.3 oz
- US Outdoor Store