Collar tabs for the SS-Verfügungstruppe uniform (literally from German: dispositional troops, that is, not administrative or security units). SS-runes and number 2 (for "Germania" Standarte) are on the left, the right is plain black (by adding pips you can make "lieutenant" ranks: SS-Sturmführer, SS-Obersturmführer, SS-Sturmhauptführer). Bullion by silver metal thread. Edge piping is made of a twisted silver-black cord.
How to sew collar tabs on? Put a collar tab on the collar of the service jacket so that it is not less than 5 mm from the edge. Fix it with a bright thread (which then remove) or glue. When collar tabs sit properly, they need to be sewn with a black thread by the edge.
The SS black service suit was formed in 1932. Since that time, the SS uniform has become a symbol of the Nazi party. Prior to this, brown shirts did not allow the SS to stand out, as they were too similar to the clothes used by the SA. To distinguish the SS from the SA, Himmler began the transition to the black uniform in 1930, and this was a milestone for German uniform. News reels, photographs and drawings of that period were full of pictures of strong people in black uniforms surrounding Hitler, aroused awe and a sense of mystery.
Until October 1934, the privates and NCO up to the SS-Obertruppführer (analogue of a sergeant) wore a black and white twisted cord along the edge of the collar and collar-tabs, and the junior command staff (lieutenant ranks) up to the rank of SS-Sturmhauptführer wore silver and black twisted cord. Higher ranks from SS-Sturmbannführer and above — 2 mm silver cord. In October 1934, the collar edging was revised; all officers then wore a silver edging for the collar-tabs and collar.
Historical information is from book of Michael D. Beaver "Uniforms of the Waffen-SS", volume 1.