New Old Stock. 
One pack sealed the 2 other packs have been opened. 
Original packaging is grubby. Brand RIK. Riken Corporation, made in Japan.

Ref on Box

Reliability for professional Engineers by RIK

Set No 20661

Mitsubishi 4M40  95mm  

0.05mm. oversize.

I am not a mechanic or knowledgeable about engines so I cannot answer technical questions.

My Ref for this item is  5647090

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