The listing is for multiple multi-tool models, some of which have more than one blade. So it depends on the model and the blade. The 8-in-one and 10-in-1 have one knife blade which positively locks open. A leaf spring nearly as thick as the blade must be depressed inward toward the body to close it. If that latch doesn't prevent the blade from closing, the knife is defective.

What grade of stainless steel?

A plus in my book. Not to be sarcastic. Not really sure the grade of metal but its a $10 multi-tool from Amazon. We've had it for a while and had to use it a couple times with maximum success. Again I'm not really sure what your expectations are of a $10 multi-tool it's not made of titanium and I don't think it's made to last forever like say a Leatherman but then again it doesn't cost $150 either. Hope that helps.

Manufacturer	Amazon Basics
Part Number	DS-MFAMZ017
Product Dimensions	10.41 x 2.21 x 4.57 cm; 140 g
Item model number	DS-MFAMZ017
Colour	Black
Material	Aluminium, Stainless Steel
Item Package Quantity	1
Number of Pieces	15
Folded knife size	0.87 x 4.1 x 1.8 inches
Included Components	Knife, Saw, Fish Scaler, Hook Remover, Scissors, Bottle Opener, Slotted Screwdriver, Phillips Screwdriver, Ice Breaker, Metal File, Nail Cleaner, Needle, Corkscrew, Key-ring
Batteries Required?	No
Item Weight	140 g

Amazon Basics 15-in-1 Multitool Pocket Knife with Sheath, Black

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