The UV glue dispenser with stainless steel needle

Used for accurate dispensing of UV glue. Is installed on the bottle. Set of 7 pcs.
Long needles: 12.7 mm.
Needle No. 1: the inner diameter of the hole - 0,21 mm; marking colour is transparent.
Needle No. 2: the inner diameter of the hole - 0.25 mm; marking colour is red.
Needle No. 3: the inner diameter of the hole - 0.34 mm; marking colour is yellow.
Needle No. 4: the inner diameter of the hole - 0,41 mm; marking colour is blue.
Needle No. 5: the inner diameter of the hole - 0.60 mm; marking colour is pink.
Needle No. 6: the inner diameter of the hole - 0.84 mm; marking colour is green.
Needle No. 7: the inner diameter of the hole - 1.37 mm; marking colour is amber.