Do these have the notch to lock onto quick release ratchets?

Yes they do, they work good on the couple quick release ratchets I own.

What is the difference between 81200D and 81200?

the set 81200D is the standard 3/8 drive extension bars there is a set 81201 which is the 3/8 wobble extension bars. there is no set 81200 on the gearwrench website

what are the lengths? thanks!

If you scroll don the page on Amazon, you will see the sizes listed: "The KD Tools 4-Piece 3/8-Inch Drive Extension Set includes 1-1/2-inch, 3-inch, 6-inch, and 12-inch extensions."

Manufacturer	GearWrench
Part number	81200D
Item Weight	590 g
Product Dimensions	44.32 x 12.45 x 2.54 cm; 589.67 g
Item model number	81200D
Size	42437
Color	Silver
Style	4-piece kit
Finish	Polished
Material	Alloy Steel
Item thickness	0.9 Inches
Power source type	Hand Powered
Item Package Quantity	1
Number Of Pieces	4
Head Style	Fixed Square
Measurement System	inch
Compatible Fastener Range	0.375 inches
Included components	1-1/2", 3", 6" & 12" Extensions
Batteries Included?	No
Batteries Required?	No

GEARWRENCH 4 Pc. 3/8" Drive Extension Set, 1-1/2", 3", 6" & 12" - 81200D

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