They’re commonly called double square bits, and you’ll also see them listed as 8-point star or sometimes spider driver bits. The tip looks like two squares offset 45°, creating eight points that fit matching 8-point fasteners.

• Where they’re used: On specialty fasteners that require an 8-point profile.
• Formats you’ll find: Hex-shank power bits for drills/impact drivers and socket-style bits for ratchets.
• Tip: Don’t confuse double square with Torx (6-point) or triple square (12-point). Matching the pattern prevents slipping or damage.

If you’re unsure, compare the fastener head shape to the bit profile and choose the one that seats fully without wobble.

“Star bit” often refers to Torx (6-point), but not every star-shaped bit is Torx. There are several star-like patterns:

• Torx (6-point): The most common “star” profile.
• Security Torx (5-point or pin-in Torx): Used on tamper-resistant screws.
• Double square (8-point): Also called 8-point star or spider.
• Triple square (12-point): A different, finer star pattern.

It’s best to match the bit to the exact head pattern on your fastener. Using the wrong style can strip the screw or damage the bit. If you’re unsure, count the points and confirm the shape before selecting a set.

The bit with eight points is the double square, often labeled 8-point star or spider. Its tip is two overlapping squares, offset to create eight contact points that fit 8-point flathead fasteners.

• How it’s sold: As hex-shank bits for drills/impact drivers, and as socket bits that fit common ratchet drives.
• Lengths: Standard and extended lengths are available for better reach.
• Avoid mix-ups: Don’t confuse with Torx (6-point) or triple square (12-point)—they are different patterns.

For best results, choose the bit that seats fully and engages the entire star profile without play.

Torque depends on the fastener size, material, and the manufacturer’s spec. Double square (8-point) bits don’t have a universal torque value. A safe approach is:

• Check specs: Look for the equipment or fastener torque recommendation first.
• Start low: Begin with a lower torque setting, then increase gradually as needed.
• Use the right tool: If a specific torque is required, use a calibrated torque wrench.
• Seat the bit: Ensure the bit is fully engaged to reduce cam-out.
• Impact use: If using an impact driver, choose impact-rated bits and proceed carefully to avoid over-tightening.

These steps can help manage torque effectively, but results vary by application.

Match the bit to your fastener’s head so it seats fully without wobble. Here’s a quick guide:

• Identify the pattern: Confirm it’s an 8-point (double square), not 6-point Torx or 12-point triple square.
• Choose the size: Common 8-point sizes include #1, #2, and #3—smaller to larger. Test fit for a snug engagement.
• Select the format: Hex-shank bits work with drills/impact drivers; socket bits pair with 1/4", 3/8", or 1/2" drive ratchets.
• Pick the length: Standard or extended lengths help with reach and visibility.
• Consider magnetization: Magnetic tips can help hold fasteners during positioning.

When in doubt, a multi-size set offers flexibility for different fasteners.