Product overview

The IRWIN STRAIT-LINE High-Visibility Marking Chalk is a powdered chalk designed for use with chalk line reels to create straight, visible guide lines on a variety of surfaces. It is commonly used in construction, carpentry, and layout work where precision marking is required.

This version comes in an 8-ounce squeeze bottle, making it easy to refill chalk line reels with minimal mess. The bright orange color is formulated for high visibility, helping lines stand out clearly even in challenging lighting conditions or on darker materials.

The bottle features a twist cap with a pointed nozzle for controlled dispensing. This allows users to direct the chalk precisely into line reels or onto surfaces without excessive spillage.

It is suitable for professionals and DIY users who need consistent, easy-to-see markings for alignment, cutting, or installation tasks.

Technical specs

• Brand: IRWIN Tools
• Model: 64905ZR
• Product type: Marking chalk
• Color: Orange (high-visibility)
• Net weight: 8 oz (227 g)
• Form: Fine powder
• Compatibility: Standard chalk line reels
• Container type: Squeeze bottle with twist nozzle

Also Known As

• IRWIN STRAIT-LINE Orange Chalk
• IRWIN 64905ZR Marking Chalk
• IRWIN High-Visibility Chalk 8 oz
• IRWIN Orange Chalk Line Powder

Other features

• Bright pigment improves line visibility on multiple surface types
• Fine powder formula supports smooth, even line snapping
• Designed for both indoor and outdoor marking use
• Bottle design helps reduce spills during refilling