I bought this product hoping I wouldn't be disappointed if this product didn't fit in the cage I bought at a price that was worth the risk. Because as it turns out, this pen doesn't fit in the small cage I bought it for, but it does fit in the larger cage I now use to take photos and videos on my Samsung Galaxy tablet. The grips are comfortable and lightweight, plus it has a cold shoe and 2 1/4" holes on the top for installing LED lights or microphones. I highly recommend this product and am in the process of buying 2 more pens that use NATO rails from the same manufacturer as this particular product.