When making macros, you can put also special enchants with use like engineering enchants on gloves or belt, etc. Instead of putting the whole name of the item in the macro, you can just add a “/use #” and save space for more abilities. Here is a list of what each number represent in a slot.

0 Ammo
1 Head
2 Neck
3 Shoulder
4 Shirt
5 Chest
6 Belt/Waist
7 Legs
8 Feet/Boots
9 Wrist/Bracers
10 Gloves
11 Finger 1 (top slot)
12 Finger 2 (bottom slot)
13 Trinket 1 (top slot)
14 Trinket 2 (bottom slot)
15 Back/Cloak
16 Main Hand
17 Off Hand
18 Ranged/Relic
19 Tabard
20 First bag (the rightmost one)
21 Second bag
22 Third bag
23 Fourth bag (the leftmost one)
40 To 67 the 28 bank slots
68 First bank bag slot
69 Second bank bag slot
70 Third bank bag slot
71 Fourth bank bag slot
72 Fifth bank bag slot
73 Sixth bank bag slot
74 Seventh bank bag slot

Example of a macro for using gloves enchant:

/use 10