Flange bearing block with lock is used to lock a screw, ball screw or similar usually at both ends. This is a cheap way to lock a screw.
Type: KFL003 (see chart for dimensions)
The ball bearing is of high quality with Zinc alloy bearing blocks and locking screws
There are unfortunately no Flange bearings of this kind for 16mm screw, the solution is a 17mm block like this and a strip of sheet metal as distance, eg. from a canned jar