Ronstan Shock Blocks - Kiwi Sailing
Ronstan Shock Blocks - Kiwi Sailing
Ronstan Shock Blocks - Kiwi Sailing
Ronstan Shock Blocks - Kiwi Sailing
Ronstan Shock Blocks - Kiwi Sailing
Ronstan Shock Blocks - Kiwi Sailing

Ronstan Shock Blocks

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From simple off the beach dinghies to massive foiling multihulls, today’s yachts and the systems for rigging and controlling them are more varied than ever. 
This diversity creates unique demands on the hardware which are nowhere more apparent than in the category of blocks. Ball and roller bearings can still provide the lowest levels of friction, but in many applications and environments, strength-to-weight ratio, durability and simplicity are the key requirements. These applications have seen the evolution of apparently simple products, whose outward appearance belies the exacting engineering and advances in materials technology that they are based on, and which still deliver excellent free-running performance. Custom made low friction rings and solid fairleads have filtered down from Grand Prix racing to the realm of the recreational sailor.

The sheaveless block
Available in four colour options - blue, green, grey and red with several attachment options, including webbing, pigtail, lashing and dyneema links, it will be the obvious choice for those kitesurfers, paragliders, control line deflections and purchase systems that require a lightweight high load capacity block.

Ultimate durability
With no moving parts, SHOCKS provide ultimate durability and are maintenance free. They are ideal where sand and grit would compromise a bearing system or where regular flushing out isn’t possible. Their gentle 3-dimensional geometry is kind on lines but is strong enough to cope with poor leads.

Soft attachment specialists
SHOCKS are designed primarily for ‘soft attachment’; spliced to a line end or lashed in place. The elongated attachment aperture is also ideal for webbing attachment, ensuring the intended orientation is maintained.

Virtually limitless applications
The applications for SHOCKS are virtually limitless, including numerous high-performance dinghy and small sailboat rigging applications including tweakers, vangs, trapezes, cunninghams, barber haulers and kite bridles. They are also handy on larger boats for uses such as lazy jacks, sail covers, tie-downs, ladder and motor hoists.

Hidden performance
At a mere 2.5g (0.1 oz), SHOCKS are outstanding performers in the strength and weight stakes. The clever design and exacting finishing also provide excellent free running at moderate changes of angle. Small & hi-tech line specialists SHOCKS accept lines from 1.4mm (1/16”) up to 8mm (5/16”) and function just as well with hi-tech uncovered braids as with traditional double braids.
They are available in colour choices to help keep complicated rigging configurations more organised. 

Unlimited use cases:

  • Vangs
  • Tweakers
  • In-spar Purchases
  • Outboard Raisers
  • Barberhaulers
  • Sail Cover Zipper Lines
  • Ladder Hoist
  • Lazy Jacks
  • Cunningham
  • Garage Hoists
  • Traveller Controls
  • Kite Bridles
  • Leech Lines
  • Trailer Tie-downs
  • Guy Lines
  • Trapeze Elastics
  • Control Lines
  • 2:1 Halyards
  • Luggage Ties


  • Performance & Versatility
  • Ultra Lightweight - only 2g!
  • Ultra Compact
  • Durable
  • Colour Coded
  • Impact Resistant
  • Small Line Optimised
  • High Load Capacity - 350kg (770lb) BL
  • Poor Alignment Tolerant
  • Soft Attachment Compatible
  • Versatile
  • Grit and Salt Resistant