Squeeze to blow and to suck. Very handy little tool which when squeezed helps blow dust and specks out of crevices and corners of mounts and frames.
The brass nozzle is 2.1mm o/d, so with a piece of 2mm i/d tube pushed on it can be used to blow into awkward places. And with a finger over the one-way valve, it can also suck dust out of a frame. Ideal for all delicate objects and mechanisms.
Dust Blower is 50mm dia, 115mm o/a.