Lowe Tri-Cam: covering range from 0.6”-5.5” (7 sizes); but #0.5 to #2 are the most useful and the most stable for belay anchors.


(主动)Active Pro: Ray Jardine developed in the late 1970's, now they are mostly called SLCD (Spring Loaded Camming Device) or friends, such as：

Lowe Balls: spring loaded pieces provided for thin-crack protection, covering cracks from 0.12”-0.47” (3 sizes)

TCU (Tri-Cam Unit) and FCU (Quad-Cam Unit)

BD C

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