Measurement: The 0.67"(17mm) to 1" ball mount is 63mm/2.48" long,17mm to 1 inch ball is great adapter for connecting B size double socket arm, compatible with Ram Mount socket arms as extra extension High-quality Material: Made of high-quality stainless steel and TPU, it is non-slip, water-resistant, and does not rust CNC MOULDING: CNC precision engraving, precise size, smooth surface, no scratching. It came out with B size 1" TPU ball to 0.67 inch(17mm) TPU ball head Non-slip and Durable: TPU over-molded ball joint are anti-slip and wear-resistant for durability and reliability in most demanding environments Wide Range of Applications: The 0.67" to 1'' ball mount base compatible with RAM Mounts, compatible with BRCOVAN any B size 1 inch ball double socket arm YIMINGYINUO 0.67" to 1" Ball Adapter Extension Bar Compatible with RAM Mounts B Size for Standard Double Socket Arms. This 17mm to 1 inch ball joiner is made of stainless steel raw material and TPU, it is non-slip, wear-resistant. It is CNC precision engraving, precise size, smooth surface, no scratching. This 0.67" to 1" ball adapter is wide range of applications: suitable for motorcycles, electric vehicles, and ATVs. Compatible with ram mount/ball mount/ram ball mount 1 inch/ram ball mount/base ball/ram mount extension arm/17mm to 25mm ball mount/17mm to 1inch ball mount/1 ram ball mount/ram ball mounts/socket mount/ball vertical mount adapter/double ball mount/ball mount b/1in ball mount adapter/ball mount base 1'' no tool installing/ram trx mount/ram ball mount 1 inch/ball mount/ram mount motorcycle/ram phone mount/ram phone holder/ram mount x-grip/ram mount motorcycle/ram ball/motorcycle ram mount/ram mount extension arm/ram mount for motorcycle/ram mount 1 inch ball/gps vehicle mounts/1in ball mount adapter/1in ball mount adapter/ram ball mount 1 inch/ball mount extension arm,etc.