What are the characteristics of the various models of surgical blades

Depending on the procedure, the location of the incision, and the purpose, blades are available in a variety of sizes and shapes and are numbered. A list of commonly used blades is described below.
Each of them has a compatible BP handle. BP handles are also numbered according to their size.
Size 3 handle is compatible with size 10, 11, 12 and 15 blades. It is the most commonly used handle when making cuts. The 3G model has a scale on the handle for measuring structures. The other type, the 3L, is an extended version of the size 3.
Size 4 handles are compatible with blades 20, 21, 22, 23 and 26. It is similar to size 3 but has a larger tip to accommodate large blades. 4G numbers are scaled along the handle. Size 4L is a longer version of size 4.
Size 7 handles are compatible with size 10, 11, 12 and 15 blades. It is an elongated handle suitable for making incisions in deep and tight spaces.
Here are some common common scalpel blade models:

NO.10
Blade with curved abdomen.
The abdomen is sharp-edged.
Used to make skin incisions.

NO.11
Blades with straight and beveled edges with pointed tips.
Used to make a puncture incision to insert a drain.

NO.12
The blade is crescent-shaped.
The inside of the crescent moon is sharp.
For suture removal, parotid gland and cleft palate surgery.

NO.15
A blade with a smaller edge.
For making precise and short cuts.
Similar to No. 10 but smaller

NO.20
Blade with curved abdomen.
The abdomen is sharp-edged.
Used to make skin incisions.
Similar to size 10, but bigger.

NO.21
Blade with curved abdomen.
The abdomen is sharp-edged.
Used to make skin incisions.
Similar to size 10, but bigger.
greater than size 20.

NO.22
A blade with a smaller edge.
Used to make skin incisions.
Similar to size 10, but bigger.
bigger than size 21

NO.23
Inserts with curved cutting edges.
Opposite is blunt.
Leaf blade.
For making long cuts.

NO.26
Blade with straight edge.
Opposite is straight
Blunt at a downward angle.