Except for rollers, Is the 22mm all stainless. Are the ball bearings sealed. I want to use it off shore

The best I can tell they are all stainless except rollers. I can't answer about the bearings but I have used mine on my Hobie 16 for years in a saltwater environment and so far they have performed flawlessly. Hope this helps.

What is the diameter of the mounting holes?

The mounting holes are .20" or 5.17mm

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HARKENSailing Dinghy Boat & Yachting - Micro Cheek Block - Low-friction Micro blocks are compact and lightweight

Product ID: 51058271

Details

Bearing Number
233
Brand
HARKEN
Item Weight
0.01 Pounds
Item dimensions L x W x H
2.5 x 0.94 x
Specification Met
Aluminum

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VT11933

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Bearing Number
233
Brand
HARKEN
Item Weight
0.01 Pounds

Description

Harken Micro Blocks, micro cheek block

HARKENSailing Dinghy Boat & Yachting - Micro Cheek Block - Low-friction Micro blocks are compact and lightweight

Specifications

ASIN	B002NSQBXM
Bearing Number	233
Bearing Type	Ball Bearing
Best Sellers Rank	#87,628 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #8 in Sailing Hardware
Brand Name	HARKEN
Compatible Lubricant	Grease
Customer Reviews	4.7 4.7 out of 5 stars (197)
Included Components	1 Cheek Block
Item Dimensions	2.5 x 0.94 x 0.5 inches
Item Weight	0.01 Pounds
Manufacturer	HARKEN
Outside Diameter	22 Millimeters
Specification Met	Aluminum
UPC	097653008477

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