Welcome to Defender Canada! 
Block Accessories
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Harken Stainless Steel U-Adaptor
$40.01 - $75.26 -
Harken Bullet Sheave
$20.27 - $23.09 -
Harken Cruising ESP Sheave
$31.55 - $54.11 -
Harken Aluminum Wire Sheave
$68.21 - $109.10 -
Harken Swivel Ball-and-Socket Block Base
$107.69 - $114.74 -
Harken Black Magic Headpost - 75/100 mm (2 15/16"/3 15/16") - SP-072
$86.59 -
Harken Black Magic Stand-Up Base - 57 mm (2 1/4") - MP-3040
$23.61 -
Harken Black Magic Roller Cage Assembly - 125 mm (5") - HBB88
$126.07 -
Harken Black Magic Sheave Assembly - 57 mm (2 1/4") - H-34389A
$45.70 -
Harken Narrow High-Load Sheaves - 76 mm (3") - 691
$254.33 -
Harken Stainless Steel Double Pin U-Adapter - 5.6 mm (3/16") - 463
$24.50 -
Harken Wire Block Split Backstay Plate Assembly - 38 mm (1 1/2") - 321
$40.06 -
Harken Dual Bullet Sheave - 22 mm (7/8") - 161
$51.29 -
Harken AirBlock Sheave - 16 mm (5/8") - 415
$18.86 -
Barton Plain Bearing Rope Sheave
$5.22 -
Barton Large Stand Up Block Base
$98.25 - $103.70 -
Barton Small Stand Up Block Base - 60330
$40.70 -
Ronstan Glass Reinforced Nylon Sheave
$24.72 - $42.88 -
Ronstan Series 100 Roller Bearing Sheave
$475.66 - $745.11 -
Ronstan Series 75 Alloy Roller Bearing Sheave
$346.80 - $554.53 -
Ronstan Series 60 Roller Bearing Sheave
$279.91 - $307.30 -
Ronstan Acetal BB Sheave
$94.98 - $109.15 -
Ronstan Aluminum BB Sheave
$76.33 - $109.62 -
Ronstan All Purpose Sheave
$12.23 - $118.40 -
Ronstan Series 60 Ratchet Sheave - RF62000
$127.48 -
Ronstan Series 60 Orbit Sheave - RF69000
$204.70 -
Ronstan Series 75 Ratchet Sheave - RF72000
$152.53 -
Ronstan Series 75 Orbit Sheave - RF79000
$273.24 -
Ronstan Series 75 Acetal Sheave - RZ01000
$24.51 -
Ronstan Series 75 Aluminum Sheave - RZ01000AW
$156.35 -
Ronstan Series 22 Ball Bearing Sheave Kit - RC00411
$111.97 -
Ronstan Series 100 Orbit Sheave - RF109000
$459.43 -
Ronstan Series 60/75 Stand-Up Spring - RF324
$154.74 -
Ronstan Series 30/60/75/100 Stand-Up Spring - RF324-2
$218.29 -
Ronstan Series 100 Spring Kit - RF328
$197.76 -
Ronstan Series 40/55 Swivel Shackle Base - RF4
$53.05 -
Ronstan Series 19 Ball Bearing Sheave Kit - RC00410
$90.82 -
Wichard Mast Step Adaptor
$22.81 - $30.34 -
Wichard Polycarbonate Sheave
$5.48 - $18.25 -
Wichard Stand Up Spring
$9.75 - $12.77 -
Wichard Swivel Clevis Adapter
$23.86 - $30.60 -
Wichard Ball Bearing Sheave with Captive Balls
$31.55 - $83.14 -
Wichard Stacked Deck Organizer for Ball Bearing Sheaves - 32 mm (1 17/64") - 81512W
$216.19 -
Spinlock Jammer Turning Block - 50 mm (1 31/32") - B50X
$106.08 -
Spinlock WL Furling Line Lead Replacement Sheave - WL-SHEAVE
$12.29 -
Ronstan Series 25 Ball Bearing Acetal Sheave - RF28000
$12.03 -
Spinlock TWR Line Organizer
$299.63 - $685.84 -
Spinlock Replacement T50 Sheave
$22.47 - $51.54