Colin Campbell from Mauchline in Ayrshire sent us a useful card which seems to have come from an old Hawkes & Black guide. You may find it useful when sizing tinsel spools.

Guide to tinsel sizes
No inches inches mm
1 .012 1/80 in 0.30
FLATS Gold or Silver (Sizes 1-11) 2 .015 1/64 in 0.40
3 .023 1/40 in 0.60
LUREX Gold or Silver 4 .030 1/32 in 0.80
(Sizes 2,4,5) 5 .040 1/25 in 1.00
6 .043 1/23 in 1.10
LUREX (all colours) 7 .048 1/21 in 1.20
(Size 2 only) 8 .052 1/19 in 1.30
9 .060 1/16 in 1.60
EMBOSSED Gold or Silver 10 .072 1/14 in 1.80
(Sizes 3-11) 11 .075 1/13 in 1.90
14 .020 1/45 in 0.50
15 .022 1/40 in 0.55
OVALS (Flat Worm) Gold or Silver 16 .030 1/32 in 0.80
(Sizes 14-19) 17 .035 1/28 in 0.90
18 .040 1/25 in 1.00
19 .058 1/15 in 1.50
ROUND THREADS Gold or Silver 20 .007 1/140 in 0.20
(Sizes 20 and 21) 21 .010 1/100 in 0.35
LACE TWIST (3-ply cord) 22 .016 1/64 in 0.40
(Gold or Silver) 23 .020 1/50 in 0.50
(Sizes 22-24) 24 .022 1/45 in 0.55
WIRES Gold or Silver (Sizes 25-27) 25 .006 1/165 in 0.15
COPPER (Fine or Heavy) 26 .005 1/200 in 0.12
LEAD (Fine) 27 .004 1/250 in 0.10