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The RAM-B-121BU with 1" rubber ball is the most common yoke base used.

The dimensions each yoke base will accommodate are listed in the product description.
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Aviation Yoke "C" Clamp Base (Accommodates 0.625" to 1.25" Rail Diameter) Marine Grade Aluminum Base with 1.0 Inch Dia. Rubber Ball
Aviation Yoke "C" Clamp Base (Accommodates 0.625" to 1.25" Rail Diameter) Marine Grade Aluminum Base with 1.0 Inch Dia. Rubber Ball
Price $31.49
Free Shipping In Stock - Ships Next Bus. Day

RAM-B-121BU more info
COMPOSITE Aviation Yoke "C" Clamp Base (Fits Rail/Edge Lip from 0.625" to 1.25") with 1 Inch Diameter Composite Ball
COMPOSITE Aviation Yoke "C" Clamp Base (Fits Rail/Edge Lip from 0.625" to 1.25") with 1 Inch Diameter Composite Ball
Price $26.49
Free Shipping Out of Stock - Email for ETA

RAP-B-121BU more info
COMPOSITE Universal MEDIUM Tough Clamp with 1 Inch Ball (Fits Flat Surface 1.75" Thick or .75" to 1.125" Round Diameter)
COMPOSITE Universal MEDIUM Tough Clamp with 1 Inch Ball (Fits Flat Surface 1.75" Thick or .75" to 1.125" Round Diameter)
Price $29.99
Free Shipping In Stock - Ships Next Bus. Day

RAP-B-397-2U more info
COMPOSITE Universal SMALL Tough Clamp with 1 Inch Ball (Fits Flat Surface 1" Thick or .25" to .75" Round Diameter)
COMPOSITE Universal SMALL Tough Clamp with 1 Inch Ball (Fits Flat Surface 1" Thick or .25" to .75" Round Diameter)
Price $23.99
Free Shipping In Stock - Ships Next Bus. Day

RAP-B-397-1U more info
LARGE Universal Tough Claw (Fits 1 Inch to 2.25 Inch Round Diameter and 0 Inch to 2.2 Inch Flat Surface) with 1 Inch Diameter Ball
LARGE Universal Tough Claw (Fits 1 Inch to 2.25 Inch Round Diameter and 0 Inch to 2.2 Inch Flat Surface) with 1 Inch Diameter Ball
Price $60.49
Free Shipping In Stock - Ships Next Bus. Day

RAP-B-401U more info
MEDIUM Universal Tough Claw (Fits 1 Inch to 1.875 Inch Round Diameter and 0 to 1.6 Inch Flat Surface) with 1 Inch Diameter Ball
MEDIUM Universal Tough Claw (Fits 1 Inch to 1.875 Inch Round Diameter and 0 to 1.6 Inch Flat Surface) with 1 Inch Diameter Ball
Price $43.99
Free Shipping In Stock - Ships Next Bus. Day

RAP-B-404U more info
SMALL Universal Tough Claw (Fits .625 Inch to 1.5 Inch Round Rail Diameter and 0 to 1.14 Inch Flat Surface) with 1 Inch and 1.5 Inch Diameter Ball
SMALL Universal Tough Claw (Fits .625 Inch to 1.5 Inch Round Rail Diameter and 0 to 1.14 Inch Flat Surface) with 1 Inch and 1.5 Inch Diameter Ball
Price $48.49
Free Shipping In Stock - Ships Next Bus. Day

RAP-BC-400U more info
SMALL Universal Tough Claw (Fits .625 Inch to 1.5 Inch Round Rail Diameter and 0 to 1.14 Inch Flat Surface) with 1 Inch Diameter Ball
SMALL Universal Tough Claw (Fits .625 Inch to 1.5 Inch Round Rail Diameter and 0 to 1.14 Inch Flat Surface) with 1 Inch Diameter Ball
Price $37.99
Free Shipping In Stock - Ships Next Bus. Day

RAP-B-400U more info
V Strap Marine Grade Aluminum Base with 1.0 Inch Dia. Rubber Ball (Fits 1 Inch to 2.1 Inch Diameter Rail)
V Strap Marine Grade Aluminum Base with 1.0 Inch Dia. Rubber Ball (Fits 1 Inch to 2.1 Inch Diameter Rail)
Price $22.99
Free Shipping In Stock - Ships Next Bus. Day

RAM-B-108BU more info